there are three basic types: energy type, power type, high temperature type. Features: (1) high energy density up to 420WH/Kg(800WH/dm3). (2) High operation voltage, 3.3V~3.6V upon loading resistance. (3) Long storage life, less than 2% of self-discharging rate per year, could be stored for 10~15 year at room temperature. (4) Non-magnetic stainless steel case, hermetically sealed. Be safe for transportation and general shock. No leakage problem Application: CMOS memory chips for PC, office automation devices, remote data logging and data acquisition systems, medical instruments, water or gas gauges, security and alarm systems pulse-/event-counters, various industrial clocks, high temperature systems etc.